That's right.
Cheers.
On 1 Jun 2006, at 21:21, Chris Holland wrote:
> Thanks Steve. So you would generate a separate matrix file in
> which the
> only EVs are the confound variables? I will try this out.
>
> Chris
>
> On Thu, 1 Jun 2006 19:57:24 +0100, Steve Smith
> <[log in to unmask]> wrote:
>
>> Hi,
>>
>> On 1 Jun 2006, at 16:54, Chris Holland wrote:
>>
>>> What is the format of the -x confound matrix file for randomise?
>>> Is it
>>> better to include variables, e.g. age as an additional EV in the
>>> design
>>> matrix or to use a separate confound matrix file?
>>
>> The confound matrix is the same format as the design.mat design
>> matrix used in FEAT and generated, for example, by the new "Glm" GUI.
>>
>> For randomise it's probably better to includes confounds using the -x
>> rather than putting them in the main design, because of the
>> limitations of permutation testing.
>>
>>> Also, will randomise deal with 4D volumes of binary images? I am
>>> able to
>>> obtain results, but am unable to verify that randomise is dealing
>>> with these
>>> volumes appropriately.
>>
>> You mean as input data I presume - yes, it can deal with them - I
>> have done this in the past - though you may need to convert them to
>> floating point format first.
>>
>> Cheers, Steve.
>>
>>
>>>
>>> Thanks...
>>>
>>> Chris
>>
>>
>> ---------------------------------------------------------------------
>> ---
>> ---
>> Stephen M. Smith, Professor of Biomedical Engineering
>> Associate Director, Oxford University FMRIB Centre
>>
>> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>> +44 (0) 1865 222726 (fax 222717)
>> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>> ---------------------------------------------------------------------
>> ---
>> ---
>> =====================================================================
>> ====
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---
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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